Page 186 - My FlipBook

I70 THE TREATMENT OF TEETH a

anterior portion is in the proper plane. After burn-
ing off the alcohol, the tip is fused in place, and the
inlay rapidly completed : there is no danger of the
porcelain moving during subsequent firing."
Since then, these specially made pieces of porce-
lain, to which the name " Porcelain Inlay Cores "
has been given, have been improved in sizes and
shapes until they may now be said to fulfil all re-
quirements in this respect. Dr. Jenkins of Dresden,
to whom the manufacturers submitted them during
the time they were perfecting them, expresses himself
as highly satisfied with them, and considers them a
very valuable invention. The merits of these cores
may be thus briefly described. The contour and
corner is built up and restored more easily, more
rapidly, and more accurately. A sharper or better
defined corner can be produced, and the resulting
combination of the core and the Jenkins' porcelain
Jenkins—
enamel produces—according to Dr.
restoration that is " immensely stronger than can
be made with any high-fusing porcelain."
Mr. Mellersh points out that " owing to a differ-
ence in the fusing point of the core and of the
porcelain enamel, careful annealing at every stage is
essential." Very gradual raising of the heat to the
fusing point of the Jenkins' enamel is essential, and
equally important is a gradual cooling down in the